Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.87: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Superoxide and peroxide chemical states of adsorbed molecular oxygen on rutile TiO2 (110) surface — •Hikmet Sezen, Alexei Nefedov, and Christof Wöll — Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

TiO2 is a highly attractive material due to its unique electron storage and transfer capabilities. In order to generate versatile chemical and physical interactions with the surface of TiO2, molecular oxygen was chosen because of its singlet and triplet electronic configurations. However, these properties of O2 have already been utilized as photo-oxidizing agent or electron scavenger,1-2 the nature of superoxide and peroxide states of molecule oxygen especially on metal oxide surfaces has not yet been understood. In this contribution, we demonstrate spectroscopic evidences about present of superoxide and peroxide species on rutile TiO2 (110) surface from both laboratory-based ultraviolet and X-ray photoelectron spectroscopies, and synchrotron-based X-ray photoelectron and near edge X-ray absorption fine structure spectroscopies.

1. I.X. Green, and J.T. Yates, The Journal of Physical Chemistry C 114, 11924 (2010). 2. M.A. Henderson, M. Shen, Z.-T. Wang, and I. Lyubinetsky, The Journal of Physical Chemistry C 117, 5774 (2013)